xapian-core/matcher/valuegepostlist.cc

   1 /** @file
   2  * @brief Return document ids matching a range test on a specified doc value.
   3  */
   4 /* Copyright 2007,2008,2011,2013 Olly Betts
   5  * Copyright 2008 Lemur Consulting Ltd
   6  * Copyright 2010 Richard Boulton
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  21  */
  22
  23 #include <config.h>
  24
  25 #include "valuegepostlist.h"
  26
  27 #include "omassert.h"
  28 #include "str.h"
  29 #include "unicode/description_append.h"
  30
  31 using namespace std;
  32
  33 PostList *
  34 ValueGePostList::next(double)
  35 {
  36     Assert(db);
  37     if (!valuelist) valuelist = db->open_value_list(slot);
  38     valuelist->next();
  39     while (!valuelist->at_end()) {
  40         const string & v = valuelist->get_value();
  41         if (v >= begin) return NULL;
  42         valuelist->next();
  43     }
  44     db = NULL;
  45     return NULL;
  46 }
  47
  48 PostList *
  49 ValueGePostList::skip_to(Xapian::docid did, double)
  50 {
  51     Assert(db);
  52     if (!valuelist) valuelist = db->open_value_list(slot);
  53     valuelist->skip_to(did);
  54     while (!valuelist->at_end()) {
  55         const string & v = valuelist->get_value();
  56         if (v >= begin) return NULL;
  57         valuelist->next();
  58     }
  59     db = NULL;
  60     return NULL;
  61 }
  62
  63 PostList *
  64 ValueGePostList::check(Xapian::docid did, double, bool &valid)
  65 {
  66     Assert(db);
  67     AssertRelParanoid(did, <=, db->get_lastdocid());
  68     if (!valuelist) valuelist = db->open_value_list(slot);
  69     valid = valuelist->check(did);
  70     if (!valid) {
  71         return NULL;
  72     }
  73     const string & v = valuelist->get_value();
  74     valid = (v >= begin);
  75     return NULL;
  76 }
  77
  78 string
  79 ValueGePostList::get_description() const
  80 {
  81     string desc = "ValueGePostList(";
  82     desc += str(slot);
  83     desc += ", ";
  84     description_append(desc, begin);
  85     desc += ")";
  86     return desc;
  87 }